Total number of coin that George has 16 + 28 + 32 + 4 = 80 coins total number of coins sold by George = 15% of 80 = 15/100 X 80 = 12 coins (ans)
16+28+32+4=80 15% out of 80 15/100 * 80 = 12 coins sold
George has a total of 80 coins in his collection. After selling 15% of his coins, he sold 12 coins. Thus, out of his collection, he sold 12 coins at the flea market.
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